Hi guys, I'm planning to buy an iPad Pro rather sooner than latter. The main duty will be working with PDFs (from 4-5 pages to several hundred pages): reading, annotating, etc. My main concern at this point is if the annotation on PDF files make them grow a lot or not. Now I'm using a 16GB 3rd gen, so I think the 32GB one will be enough. Do you agree guys? Thank you!